Safety-valve.



6.1. MANNING. SAFETY VAIVE. APPLICATION FILED OCT. 14| |916.

1,236,583. PatemedAug. 1411917.11v

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UNITED sTATEs PATENT oEEIoE.-

COLEMAN J'. MANNING, 0F MEDFORD, MASSACHUSETTS'.

SAFETY-VALVE.

i Specification of Letters atent.

Patented Aug. 14, 1917.

Application filed October 14, 1916. Serial No. 125,736.

To all whom it may concern.'

Be it known that 1, COLEMAN J. MANNING, a citizen of the United States, residing at Medford, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Safety-Valves,

of which the following isa specification.

This invention has for its object to provide a safety valve the valve seat and the valve member or body' of which are movable or displaceable conjointly by an increment of the fluid pressure controlled by the valve and are held in coacting relation to 'each other by resilient means until the dis- Fig. 2 represents a section onl line 2-2 of Fig. 1;

Fig. 3 represe ts a section on line 3-3 of Fig. 2; r Fig. 4 represents a section on line t-Li jof Fig. 1;

Figs. 5 and'G represent sectional views of modications.

kThe same reference characters indicate the same or similar'parts in all the lviews. Referring first to Figs. 1 to 4 inclusive,

the valve easing is' preferably composed of anrinner member 12 having athreaded nipple 13 adapted to be engaged with a containcr 'of fluid under pressure, and an outer kmember 14: having `an externally `threaded flange 15 engaged with an intenall y threaded flange 16 on the member' 12. Said members constitute a conduit having an inlet 16L formedin the member 12, and an outlet 1'7 18 represents a sure at the inlet end of the casing and normally bearing .on a stop shoulder forming a valve seat 19 with-m the member 12.

2() represents a fioating valve seat which is preferably an annulus having a beveled i internal face conforming closely to the beveled external face of vthe valve body. As here shown the valve seat is provided with a tubular shank 21 formed integral therewith.

The valve seat 2 and'valv-e body 18, vWhenfree from fluid pressure, normally gravitate to the position shown by Fig. 2. Resilient means, .preferably embodied in a volute spring 23 of approximately conical formation', arranged normally to exert little or no downward pressure on the. valve seat 20 and, through the latter, on the valve body, lends Aresistance to upward or out-v ward movement of the fioatingvalve seat and the valve body, or, in other words, tends to keep the valve 18 from leaving Aiived seat 19, for the spring 23 is brought into action as soon as the valve body begins upward movement.

When thev fiuid pressure. is insuiiicient to overcomefthe resistance of the spring23,the valve seat 20 and valve body remain in the position shown by Fig. 2. An `increment of pressure displaces the seat 20 and body 18 outwardly fromsaid position4 without -separation of said parts. I have. provided means for` arresting or limiting the outward displacement of the -valve body before the valve seat 2O reaches the outward extreme of its movement, and when themovement of the valve body 18 is thusarrested the continued movement of the valve seat 20 causes its separation from the valve body and permits the escape of yiluid untilthe pressure is reduced.

1. here show said means embodied in a stem 25 attached to the valve body and eX- tending through the tubular shank 21 into the casing member 14. and astop 2G secured to the member 14 and located in the path of the'v stem. said stop being preferably a screw-threzuled plug engagedwith a tapped orifice in the member 14, andA adjustable by rotation to arrest the stem at any desired point.

When the displacement of the stem is arrested, a continued displacement of the valve let 17. lVhen however the valve body is seated on the valve seat 20 so that the two coact, the passage of' fluid through the casing is prevented by means provided for that purpose and preferably embodied m a flexible annular diaphragm 28 engaged at 1ts outer edge with the casing and at nsinner edge with theva 'e seat 20, as indicated by Fig. 2. Said diaphragm may be made of frictioned textile fabric or of any other suitable material, and is sufliciently flexible to con form to one end of the spring 23, as shown. The spring 23 affords substantial lateral support to the diaphragm when the latter is under fluid pressure. This permits the use of a light and flexible diaphragm for high pressures. By decreasing the number of convolutions of the spring 23, the lateral support for the diaphragm will be diminished and the diaphragm will be more responsive. The same effect 'could be obtained by using a. spring of thinner stock. On the other hand, by thickening the spring the support given to the diapllragm would `be increased and the diaphragm would be less responsive.

The diaphragm moves with the valve seat and maintains a fluid-tight flexibleconnection between said valve scat and casing so that there can be no escape of fluid until the valve body is arrested b v the stop 2G and the valve seat separates from the valve body.

To normally hold the valve body against the valve seat 20 l provide a light auxiliary spring 29 interposed between inner and outer.

abutments 30, 3l, which may be nuts screwed respectively on the tubular shank 2l and the stein In the modification shown by Fig. 5 the valve seat 20 is a tube having a screw thread or other engagement with one end of a tube 33, the other end of which is secured to an annular resilient metal diaphragm 34 forming one side of a chamber the margin of which is engaged as shown with the casing.

The valve body 1S having a stem 25 is held against the valve seat by an auxiliary spring 29a.

The resilient diaphragm 34 is a substitute for the spring and for the diaphragm 28, and not only holds the valve seat 20 yieldingly against the valve body 18 but also prevents the passage of fluid through the easing while the valve seat and valve body eoact.

Then the diaphragm 34 is displaced outwardly by a predetermined increment of fluid pressure` the stem 95 strikesthe stop 26 and is arrested thereby with the result already described. 'lhe bottom of the chamber 3G, of which the diaphragm 34 forms a part. is seated on the member l2 and communicates as shown with the inlet 16.

Fig. 6 shows another which a plurality of resilient diaphragms 3l 34h are provided, these collectively performing the functions of the diaphragm 3ft. Said diapl'n'agms 3l and the companion diaphragms 34h form parts of a series of chambers, which are connected by tubes 38. The bottomdiaphragm of the lower chamber is seated on the member l2 and communicates with the inlet 16a. The top diaphragm of the upper chamber is engaged with the tube 33.

Having described my invention, I claim:

l. A. safety valve comprising a casing forming a conduit having an inlet and an outlet and having a shoulder forming a fixed valve seat at the inlet, a floating valve seat between said fixed seat and the outlet, a valve body arranged to eoaet with both said valve seals but movable bodily from said fixed valve seat and with said floating modification, in

, valve seat by fluid pressure at the inlet suflcient to displace the valve body and the floating valve seat, and means for limiting the displacement of the valve body from said fixed seat and permitting the separation of the floating seat hodily'from said valve body, means being provided 'for preventing the passage of fluid through the casing when the valve body coacts with the floating seat.

2. A safety valve comprising a easing forming a conduit having an inlet. and an outlet and having a'shoulder forming a fixed valve seat at the inlet, a floating valve seat between said fixed seat and the outlet, a valve body arranged to coact with both said valve seats but movable bodily from said fixed valve seat and with said floating valve seat by fluid'pressure at the inlet suflieient to displace the valve body and the floating valve seat` means for limiting the displacement of the valve body from said fixed seat and permitting the separation of `the floating seat bodily from said valve body` and a flexible annular diaphragm en gaged at its inner edge with said floating valve seat and at its outer edge with said casing to prevent the passage of lluid through thel easing when the valve body eoaetswith said floating valve seat.

3. A safety valve. comprising a easing forming a conduit having an inlet and au outlet and having a shoulder forming a fixed valve seat at the inlet. a floating valve seat between said fixed seat and the outlet, a valve body arranged to eoaet with both said valve seats but movable from said fixed valve seat and with said floating valve seat by fluid pressure at the inlet sufficient to displace the valve body and the floating valve seat, means for limiting the displacement of the valve body from said fixed seat and permitting the separa-tion of the floata volute spring adapted to yieldingly coning seat from said valve body, a flexible anfine the valve seat and diaphragm againsn nular diaphragm engaged at its inner edge said fluid pressure. with said Heating valve seat and at its outer In testimony whereof I have affixed my edge with said Casing to prevent the passage signature.

of Huid through the casing when the valve body coacts with the floating valve seat, and COLEMAN J. MANNING. 

